We'll want to know the router make, model and firmware version.
Also, be sure the date and time on the router is correct.
I am being driven even madder than normal by my bank website. I get a secure connection fail message for the past two days. I use build 1803 of Windows 10. Here is what I have found so far:
Issue is browser independent. Have tried Chrome, Edge and Firefox.
Have reset both my Att modem and Nighthawk 7000 router to no effect.
At my neighbor's house I can connect to the bank just fine.
I can connect to other bank websites like bank america and wells fargo without issue.
I changed my about:config security.ssl.enable_ocsp_stapling setting in Firefox, no effect.
Clearing caches and cookies - no effect.
Updated router firmware - no effect.
The bank advised me that it might be a firewall problem so I turned off Windows firewall. No effect.
If I plug my laptop into my modem and bypass my router, I can connect.
What the hell could be going on?